3.14159 Of course, you can take it much further, but that's a good working figure.
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12/pi is equal to 12/pi, 12/3.14 (most common rounding of Pi) is about 3.822
3.14
How many places do you want it figured to? 3.14159 is a fairly common answer, but the value of pi is infinite.
(pi)(1/pi)=1.4396 ...
the same as pi squared, which is 9.86960440109